unprecedented

un|prec|edent|ed /ʌnpr'esɪdentɪd/
1 [ADJ]
If something is unprecedented, it has never happened before.
Such a move is rare, but not unprecedented...
In 1987 the Socialists took the unprecedented step of appointing a civilian to command the force.
2 [ADJ] usu ADJ n
If you describe something as unprecedented, you are emphasizing that it is very great in quality, amount, or scale.
Each home boasts an unprecedented level of quality throughout...
The scheme has been hailed as an unprecedented success.

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